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Golub & Van Loan (1996, §5.2) call Q 1 R 1 the thin QR factorization of A; Trefethen and Bau call this the reduced QR factorization. [1] If A is of full rank n and we require that the diagonal elements of R 1 are positive then R 1 and Q 1 are unique, but in general Q 2 is not.
In numerical linear algebra, the QR algorithm or QR iteration is an eigenvalue algorithm: that is, a procedure to calculate the eigenvalues and eigenvectors of a matrix. The QR algorithm was developed in the late 1950s by John G. F. Francis and by Vera N. Kublanovskaya , working independently.
Download QR code; Wikidata item; Print/export ... Facebook Messenger and WhatsApp had about one billion monthly active users in 2016 but did not offer most of the ...
Defunct as of 2019, replaced by standard QR codes. Micro QR code: Micro QR code is a smaller version of the QR code standard for applications where symbol size is limited. Micro PDF417: MicroPDF417 is a restricted size barcode, similar to PDF417, which is used to add additional data to linear barcodes. MMCC
QR Ph (officially the National QR Code Standard) is the standardized quick-response code system adopted in the Philippines, which is based on the Europay-Mastercard-VISA (EMV) standard. It serves as a swift and secure payment method for customers of both participating banks and non-bank electronic money issuers (EMI) in the country.
vCard, also known as VCF (Virtual Contact File), is a file format standard for electronic business cards. vCards can be attached to e-mail messages, sent via Multimedia Messaging Service (MMS), on the World Wide Web, instant messaging, NFC or through QR code.
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